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    Wyświetlanie 1-6 z 6
    Tytuł:
    Measurement of combined gap in whole process of transmission lines’ live working based on 3D laser point cloud
    Autorzy:
    Wang, Ying
    Zhang, Haitao
    Lv, Qiang
    Gao, Qiang
    Yi, Mingxing
    Powiązania:
    https://bibliotekanauki.pl/articles/27309938.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    3D model
    combined gap
    laser point cloud
    live working
    transmission lines
    Opis:
    Transmission lines’ live working is one of an effective means to ensure the reliable operation of transmission lines. In order to solve the unsafe problems existing in the implementation of traditional live working, the paper uses ground-based lidar to collect point cloud data. A tile based on the pyramid data structure is proposed to complete the storage and calling of point cloud data. The improved bidirectional filtering algorithm is used to distinguish surface features quickly and obtain a 3D model of the site. Considering the characteristics of live working, the speed of data reading and querying, the nearest point search algorithm based on octree is used to acquire a real- time calculation of the safe distance of each point in the planned path, and the safety of the operation mode is obtained by comparing with the value specified in the regulation, and assist in making decisions of the operation plan. In the paper, the simulation of the actual working condition is carried out by taking the “the electric lifting device ascending” as an example. The experimental results show that the established three-dimensional model can meet the whole process control of the operation, and has achieved practical effect.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 3; 737--753
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique
    Autorzy:
    Ji, Qiang-min
    Wang, Ya-li
    Gao, Xiao-yong
    Gao, Hui
    Zhai, Yao-fei
    Powiązania:
    https://bibliotekanauki.pl/articles/1398971.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.55.-m
    Opis:
    Highly-oriented ZnO thin films prepared by using low-cost technique such as sol-gel technique are of much importance to ZnO-based white light-emitting diodes. The chose of proper preheating temperature in sol-gel technique is still critical for highly-oriented ZnO thin film so far. The mechanisms for the preheating in the formation of ZnO thin film and for the reactions involved in the sol solution have not been clearly stated yet. Thus, in this work, the highly-oriented ZnO thin films were prepared on glass substrates by using sol-gel spin-coating technique. The sol solution was prepared by using the two-step method rather than usual one-step method, which facilitates the understanding of the mechanism for the reactions involved in the sol solution. The effect of the preheating temperature on the microstructure and the optical properties of the films were in particular investigated. The mechanisms for the preheating in the formation of the films and for the reactions involved in the sol solution prepared by the two-step method were also proposed in terms of the experimental results. The preheating not only enhances the volatilization of the solvent 2-methoxyethanol and the decomposition of the residual organic species, but also results into the formation of small number of ZnO particles. The preheating temperature of 300°C is most favorable for the highly-oriented ZnO thin film. Increasing the preheating temperature results into the blue shift of the absorption edges of the films. This can be explained by using the quantum-size effect. The photoluminescence spectra of the films show an UV emission at the near-band edge and a broad green-yellow emission at 470-620 nm. The former is closely related to the excitons, while the latter is to the intrinsic defect species in the film.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1191-1196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual strength assessment of wind turbine rotor blade composites under combined effects of natural aging and fatigue loads
    Autorzy:
    Gao, Jian-Xiong
    An, Zong-Wen
    Ma, Qiang
    Bai, Xue-Zong
    Powiązania:
    https://bibliotekanauki.pl/articles/1841943.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    wind turbine rotor blade
    natural aging
    fatigue loads
    residual strength
    composite material
    Opis:
    In this paper, the combined effects of natural aging and fatigue loads are considered to assess the residual strength of wind turbine rotor blade composites under actual service environments. Firstly, a comprehensive environmental factor (CEF) methodology is adopted to quantify the combined effects of environmental factors on residual strength. Meanwhile, the artificial accelerated aging test data are used to determine the weight coefficients of the CEF. Subsequently, a two-variable function is presented to characterize the relationship among residual strength, aging time and the CEF. The natural aging test data are utilized to estimate the unknown parameters of the two-variable function. Finally, the combined effects of natural aging and fatigue loads are considered, and a residual strength model is proposed to analyze the strength degradation behaviors of the wind turbine rotor blade composites. The results indicate that fatigue loads have negative effect on the residual strength, while natural aging has both positive and negative effects on the residual strength.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 4; 601-609
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Tensile Properties and Microstructures of Different Sites in Al-Si Alloy Casting Component
    Autorzy:
    Tao, Jianquan
    Xiang, Lin
    Chen, Xidong
    Sun, Jipeng
    Wang, Yanbin
    Du, Chuanhang
    Peng, Feifei
    Gao, Shiqing
    Chen, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/27765052.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ZL114A alloy
    plaster-mold casting
    tensile properties
    microstructure
    fracture
    Opis:
    The tensile properties and microstructures of ZL114A alloy component with a complex shape are investigated at room temperature and 200°C, using the tensile tests, scanning electron microscopy and electron backscattering diffraction. Both thin wall and thick structure exhibit excellent properties, of which max ultimate tensile strength and elongation at break reach 314 MPa and 2.5% at room temperature, respectively. The ultimate tensile strengths of thin wall are 40 MPa and 25 MPa greater than those of thick structure at room temperature and 200°C, respectively. Moreover, the eutectic Si phases of thin wall exhibit a predominantly spherical morphology while of the morphology of thick structure are rod-like, resulting in the different mechanical properties between thin wall and thick structure. The fracture morphologies of thin wall and thick structure are studied to explain the difference in performance between thin wall and thick structure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 585--589
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Newly identified transcripts of UL4 and UL5 genes of human cytomegalovirus
    Autorzy:
    Gao, Shuang
    Ruan, Shan
    Ma, Yanping
    Li, Mali
    Wang, Lin
    Zheng, Bo
    Qi, Ying
    Sun, Zhengrong
    Huang, Yujing
    Ruan, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/1039141.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    HCMV
    UL4
    UL5
    transcript
    Opis:
    Human cytomegalovirus (HCMV) UL4 and UL5 genes are two members of the RL11 gene family. In an earlier study, three UL4 transcripts of about 1.7, 1.5 and 1.4 kb were found in early and late classes after infection by the Towne strain by nuclease protection and primer extension analyses. In the present study, two UL4 transcripts (1.5 and 1.7 kb) were found by cDNA library screening, Northern blot, 3' and 5' RACE analyses to appear initially in the immediate early phase and one UL4 transcript (1.4 kb) in the late phase in a low-passage clinical isolate. Furthermore, two novel low-abundance UL5 transcripts with the same 3' terminus as the identified UL4 transcripts in the UL4-UL5 gene region were found in late class RNAs.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 1; 97-101
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue life prediction of wire rope based on grey particle filter method under small sample condition
    Autorzy:
    Zhao, Dan
    Liu, Yu-Xin
    Ren, Xun-Tao
    Gao, Jing-Zi
    Liu, Shao-Gang
    Dong, Li-Qiang
    Cheng, Ming-Shen
    Powiązania:
    https://bibliotekanauki.pl/articles/2038206.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    wire rope
    fatigue life prediction
    small sample size
    grey theory
    particle filter method
    Opis:
    The fatigue life prediction of wire ropes has two main characteristics: a large test sample size and uncertain factors. In this paper, based on the small number of wire rope fatigue life data, the grey particle filter method has been used to realize the fatigue life prediction of wire rope under different load conditions. First, the GOM(1,1) model is constructed and the reliability life data of wire rope is predicted under small sample size. Then, P-S-N curve of the dangerous part is determined by combining the equivalent alternating stress of the dangerous part of the wire rope during the fatigue test. Subsequently, the particle filter method is used to modify P-S-N curve. Finally, the fatigue life prediction model of wire rope is obtained based on fatigue damage accumulation, which realized the fatigue life prediction under different load conditions, and the results were compared with that from the test. The results show that the proposed method is effective and has high accuracy in wire rope fatigue life prediction under single, combined loading conditions and small sample size.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 3; 454-467
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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